fix deprecated methods and return type

Boyer-Moore-Horspool/BoyerMooreHorspool.playground/Contents.swift

@@ -13,16 +13,16 @@
   http://www.drdobbs.com/database/faster-string-searches/184408171
 */
 extension String {
-    func index(of pattern: String, usingHorspoolImprovement: Bool = false) -> Index? {
+    func index(of pattern: String, usingHorspoolImprovement: Bool = false) -> Int? {
         // Cache the length of the search pattern because we're going to
         // use it a few times and it's expensive to calculate.
-        let patternLength = pattern.characters.count
-        guard patternLength > 0, patternLength <= characters.count else { return nil }
+        let patternLength = pattern.count
+        guard patternLength > 0, patternLength <= self.count else { return nil }
 
         // Make the skip table. This table determines how far we skip ahead
         // when a character from the pattern is found.
         var skipTable = [Character: Int]()
-        for (i, c) in pattern.characters.enumerated() {
+        for (i, c) in pattern.enumerated() {
             skipTable[c] = patternLength - i - 1
         }
 
@@ -57,7 +57,7 @@ extension String {
             if c == lastChar {
 
                 // There is a possible match. Do a brute-force search backwards.
-                if let k = backwards() { return k }
+                if let k = backwards() { return k.encodedOffset }
 
                 if !usingHorspoolImprovement {
                     // If no match, we can only safely skip one character ahead.

Boyer-Moore-Horspool/BoyerMooreHorspool.playground/playground.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

Boyer-Moore-Horspool/BoyerMooreHorspool.playground/timeline.xctimeline

@@ -3,17 +3,17 @@
    version = "3.0">
    <TimelineItems>
       <LoggerValueHistoryTimelineItem
-         documentLocation = "#CharacterRangeLen=0&amp;CharacterRangeLoc=75&amp;EndingColumnNumber=37&amp;EndingLineNumber=3&amp;StartingColumnNumber=9&amp;StartingLineNumber=3&amp;Timestamp=503226447.616217"
+         documentLocation = "file:///Users/francisco_saldana/Documents/Nearsoft/Open%20source/swift-algorithm-club/Boyer-Moore-Horspool/BoyerMooreHorspool.playground#CharacterRangeLen=0&amp;CharacterRangeLoc=75&amp;EndingColumnNumber=21&amp;EndingLineNumber=2&amp;StartingColumnNumber=21&amp;StartingLineNumber=2&amp;Timestamp=563159867.556089"
          selectedRepresentationIndex = "0"
          shouldTrackSuperviewWidth = "NO">
       </LoggerValueHistoryTimelineItem>
       <LoggerValueHistoryTimelineItem
-         documentLocation = "#CharacterRangeLen=0&amp;CharacterRangeLoc=75&amp;EndingColumnNumber=26&amp;EndingLineNumber=3&amp;StartingColumnNumber=9&amp;StartingLineNumber=3&amp;Timestamp=503226447.61657"
+         documentLocation = "file:///Users/francisco_saldana/Documents/Nearsoft/Open%20source/swift-algorithm-club/Boyer-Moore-Horspool/BoyerMooreHorspool.playground#CharacterRangeLen=0&amp;CharacterRangeLoc=75&amp;EndingColumnNumber=21&amp;EndingLineNumber=2&amp;StartingColumnNumber=21&amp;StartingLineNumber=2&amp;Timestamp=563159867.5563149"
          selectedRepresentationIndex = "0"
          shouldTrackSuperviewWidth = "NO">
       </LoggerValueHistoryTimelineItem>
       <LoggerValueHistoryTimelineItem
-         documentLocation = "#CharacterRangeLen=0&amp;CharacterRangeLoc=75&amp;EndingColumnNumber=25&amp;EndingLineNumber=3&amp;StartingColumnNumber=9&amp;StartingLineNumber=3&amp;Timestamp=503226447.616725"
+         documentLocation = "file:///Users/francisco_saldana/Documents/Nearsoft/Open%20source/swift-algorithm-club/Boyer-Moore-Horspool/BoyerMooreHorspool.playground#CharacterRangeLen=0&amp;CharacterRangeLoc=75&amp;EndingColumnNumber=21&amp;EndingLineNumber=2&amp;StartingColumnNumber=21&amp;StartingLineNumber=2&amp;Timestamp=563159867.556504"
          selectedRepresentationIndex = "0"
          shouldTrackSuperviewWidth = "NO">
       </LoggerValueHistoryTimelineItem>

Boyer-Moore-Horspool/BoyerMooreHorspool.swift

@@ -6,16 +6,16 @@
   http://www.drdobbs.com/database/faster-string-searches/184408171
 */
 extension String {
-    func index(of pattern: String, usingHorspoolImprovement: Bool = false) -> Index? {
+    func index(of pattern: String, usingHorspoolImprovement: Bool = false) -> Int? {
         // Cache the length of the search pattern because we're going to
         // use it a few times and it's expensive to calculate.
-        let patternLength = pattern.characters.count
-        guard patternLength > 0, patternLength <= characters.count else { return nil }
+        let patternLength = pattern.count
+        guard patternLength > 0, patternLength <= self.count else { return nil }
 
         // Make the skip table. This table determines how far we skip ahead
         // when a character from the pattern is found.
         var skipTable = [Character: Int]()
-        for (i, c) in pattern.characters.enumerated() {
+        for (i, c) in pattern.enumerated() {
             skipTable[c] = patternLength - i - 1
         }
 
@@ -50,7 +50,7 @@ extension String {
             if c == lastChar {
 
                 // There is a possible match. Do a brute-force search backwards.
-                if let k = backwards() { return k }
+                if let k = backwards() { return k.encodedOffset }
 
                 if !usingHorspoolImprovement {
                     // If no match, we can only safely skip one character ahead.